Up-and-coming No. 4 maegashira Hakuoho sprang a stunning upset to knock new yokozuna Onosato off the top of the leaderboard at the Nagoya Grand Sumo Tournament on Sunday.The 21-year-old Hakuoho's unexpected victory left sekiwake Kirishima tied for the lead with three rank-and-file wrestlers at 7-1 on Day 8 of the 15-day tournament at IG Arena.Onosato (6-2) had made short work of Hakuoho (4-4) in their only previous top-division meeting in May, but things did not go to plan for the new yokozuna as he faced a strong opening charge from the burly youngster.With the 25-year-old grand champion t…READ FULL ARTICLE